Hi there!
I had the same problem, but was able to solve this only by using “Plugin Organizer”. Just disable the “Image Border” plugin in your contact form page or where you use recaptcha!
Hope this helped!!

Hi,
another way to solve the issue is to remove from the “Image Border” core file the !important property. Open the “wp-image-borders.php” file and remove all the !important properties to every tag. I’m using this now, without Plugin Organizer due to the same problem you said. Now to apply another specific style to your immage use custom css (if your theme doesn’t already have this module you can use many plugins allowing this, e.g. CSS Plus or Simple Custom CSS) or simply attach the tag to your theme main style sheet (but in this way, after each theme update you need to add those tags again). Just create a new CSS Class, attach it to the whole theme or single page/post (depending on the chosen plugin) and specify this class in the image advanced option (first add normally the image to the post/page,then open the image properties and go to the advanced option tab).
However the use and effect of this style property is related to your theme style sheet.
😉